Mo<sub>2</sub>C增强M2高速钢球磨粉末的致密化及力学性能

doi:10.19976/j.cnki.43-1448/TF.2021100

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Abstract High-energy ball milled M2 high speed steel powder mixed with 0-10% (mass fraction, the same below) Mo₂C were cold-pressed and subsequently densified by sintering under vacuum. The densification behavior and mechanical properties of the sintered samples were investigated, and the effect of Mo₂C on the sintering densification of M2 steel powder was analyzed. The results show that the refinement of raw material powder by high-energy ball milling can improve the sintering activity of powder and promote the densification of the green compact in the middle stage of sintering. Both M2 steel and Mo₂C reinforced M2 steel with nearly full density (over 98% of theory density) have been obtained at 1 180 ℃ by solid state sintering. The Mo₂C added to M2 steel powder substantially reacts with Fe matrix and transforms to M₆C phase at 950 ℃, and the reactive sintering and activated sintering can accelerate the densification of the green compacts at the intermediate stage of sintering. A large number of dispersed M₆C and M₂C carbides formed during the mid and later stage sintering inhibit grain growth of matrix and improve the hardness and bending strength of sintered compacts. Attracting mechanical properties of sintered M2 steel reinforced with 10% Mo₂C particles are achieved, showing satisfactory bending strength of 3 135 MPa and hardness of 59.6 HRC. The sinter ability and mechanical properties of M2 steel are improved effectively by the raw powders refinement, reaction diffusion of Mo₂C and redox reaction of metal particles, which is expected to provide a technical reference for the preparation of other difficult- to-sinter high speed steels.

Key words： high speed steel high-energy ball milling microstructure carbide sinter ability

Received: 24 November 2021 Published: 07 May 2022

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	CHEN Nan
	LONG Xuehu
	TENG Hao
	LI Zhiyou

Cite this article:

CHEN Nan,LONG Xuehu,TENG Hao, et al. Densification and mechanical properties of ball milled M2 high speed steel powder reinforced with Mo₂C[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(2): 161-170.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2021100 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I2/161

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